The Hieromartyr Hypatius, Bishop of Gangra, was bishop of the city of Gangra in Paphlagonia (Asia Minor). In the year 325 he participated in the First Ecumenical Council at Nicea, at which the heresy of Arius was given anathema.

When Saint Hypatius was returning in 326 from Constantinople to Gangra, followers of the schismatics Novatus and Felicissimus fell upon him in a desolate place. The heretics ran him through with swords and spears, and threw him from an high bank into a swamp. Like the Protomartyr Archdeacon Stephen, Saint Hypatius prayed for his murderers. A certain Arian woman struck the saint on the head with a stone, and he died. The murderers hid his body in a cave, where a Christian who kept straw there found his body. Recognising the body of the bishop, he hastened to report about this in the city, and the inhabitants of Gangra piously buried the remains of their beloved archpastor.

After death the relics of Saint Hypatius won renown for numerous miracles, in particular the casting out of demons and for healing the sick.